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SinoCor is a program conducting graphic correlation, a widely-used method of quantititave biostratigraphy. SinoCor 4 provides several mathematical algorithms for generation of the LOC and calculates the equations for them. Furthermore, except for the preservation of the final result, SinoCor provides the possibility of storing and loading the processing data in each previous step, such as selection of points and equations of LOCs. Users can use the ‘Backward’ and ‘Forward’ functions to retrieve any previous data and operations. Because all the data and operations are saved in one SinoCor project file, users can pick up and continue their work at any time. All data and charts, such as the range data of the composite standard, correlation chart and composite standard range chart, can be outputted as an excel file, pdf file, or script file for Corel Draw.